Yoda was based on President Spencer W. Kimball

False

It is most likely coincidence that Yoda and Spencer W. Kimball both had squeaky, rough voices, tufts of white hair, and urged people not to try, but to do. Someone who worked on the Yoda model stated in an interview that is was never discussed to model Yoda after Kimball and that Einstein was actually used as a model, along with other faces.